Band-end fastener for mandrels



Dec. 11, 1962 H. SMEETS 3,067,964

DRUM FOR WINDING ON AND UNWINDING COLD-ROLLED BANDS Original Filed Sept. 25, 1957 2 Sheets-Sheet 1 H. SMEETS Dec. 11, 1962 DRUM FOR WINDING ON AND UNWINDING COLD-ROLLED BANDS 2 Sheets-Sheet 2 Original Filed Sept. 25, 1957 Unite State This invention relates to a further development of the winding drum for winding and unwinding cold-rolled bands which is divided out from my prior application Serial No. 686,181, filed on the 25th of September 1957, now Patent No. 2,989,263, and more particularly to means for securing one end of a cold-rolled band or web to an expandable mandrel.

My said prior patent relates to a winding drum the use of which is substantially limited to thin cold-rolled hands. This winding drum, formed of a plurality of segments, guided in dovetail-shaped grooves and spreadable by means of a spreader body in the form of a stepped core provided with wedge surfaces, and of barb-shaped closing fillets arranged between the joints of the segments and likewise spreadable, is adjustable, by axial displacement of the stepped core, to three different diameters. The wedge surfaces of the stepped core that spread asunder the closing fillets have a greater pitch than the wedge surfaces that spread asunder the segments, and are so designed that when the closing fillets reach their most widely spread position they form, with the segments, a closed drum periphery, whereas the segments can be expanded even beyond this position. In the unexpanded position of the winding drum, owing to the above-mentioned difference in pitch, slots are formed between the closing fillets and the segments, and into one of these slots the end of a band is introduced when the band is to be wound on to the drum. Upon axial displacement of the stepped core the closing fillets approach the segments, owing to the greater inclination of the wedge surfaces associated with the former, and one of the fillets grips the end of the band firmly against one of the segments.

As in our said prior specification, all the closing fillets of a winding drum may be alike. This has the advantage that the end of a band to be wound on can be introduced into any convenient slot between a closing fillet and a segment. This construction of the winding drum, however, is only appropriate for thin bands, since the band end introduced between a closing fillet and a segment permits the closing fillets to spread out only until the band end is clamped against the segment. This gives rise to gaps between the remaining closing fillets and segments, and the thicker this band end is, the wider will be the gaps. The clearance that there always is in the guides of the segments and closing fillets, and the elasticity of the structural elements of the winding drum, moderate these gaps to a certain extent, so that when thin bands are being wound on, the winding drum will nevertheless exhibit a substantially closed periphery, or at least the gaps will be negligibly small. Upon the insertion of a comparatively thick band end, however, inadmissibly large gaps would occur between the closing fillets and the segments.

The object of the present invention is therefore, by a suitable clamping means, to extend the range of application of this drum to the winding and unwinding of thick cold-rolled bands.

According to the invention, on at least one of the barb-shaped closing fillets provided between the joints of the segments to close the drum periphery in the first spreading stage, a wedge-shaped clamping fillet is provided. For this purpose the closing fillet, upon an inclined surface co-operating with the adjacent segment, is formed with a recess extending over the entire length of the fillet, and substantially triangular in cross section, in which the wedge-shaped clamping fillet is accommodated and resiliently'supported in the radial direction of the drum. The clamping fillet is thus located in the base of the recess in the closing fillet, upon a surface parallel to the radial adjusting direction thereof, and constitutes, with its clamping surface, the inclined surface of the closing fillet.

According to a further feature of the invention, the inclined surface of the clamping fillet adjacent to a segment is fluted or corrugated, so that the coefiicient of friction between this roughened inclined surface and the clamped-in band end is greater than that which prevails between the approximately radial bearing surface of the clamping fillet and the base of the recess in the closing fillet.

The invention is illustrated by way of example in the accompanying drawings, in which:

FIGURE 1 shows a longitudinal section through the winding drum on the line 11 in FIGURE 2;

FIGURE 2 shows on a larger scale a partial view of the cross section on the line 2-2 in FIGURE 1;

FIGURE 3 shows part of FIGURE 2 on a still larger scale; and

FIGURE 4 shows a longitudinal section at right angles to that of FIGURE 1, through the winding drum, the upper part of this section showing the wedge surfaces that impel the segments and the closing fillets in a radial direction.

As in the drawings accompanying the above-mentioned patent, 1 denotes a spreader member in the form of a stepped core mounted rotationally fast on a shaft 3 by means of keys 2 but axially slidable thereon, which, for the spreading of the closing fillet 4, is provided with wedge-surfaces 5. The wedge surfaces 5 carry thrust pieces 6 of highly wear-resistant material. The closing fillets 4 run over rollers 7 for the purpose of reducing friction. In the unexpanded condition of the drum the closing fillets 4 are held by springs 53 on the stepped core 1. For this purpose, bolts 9 are inserted in grooves 10 in the stepped core 1, and on to these bolts cap nuts 11 are screwed, against which the springs 3 hear.

The closing fillets 4 somewhat resemble barbed arrowheads in shape, and are arranged between the joints of the segments 12, which have inclined or wedge-shaped grooves 14 in the spreader body 1, as shown in FIG- URE 4. In the unexpanded position of the winding drum the closing fillets 4 are drawn back below the segments 12, so that between the closing fillets 4 and the segments 12 slots appear, into one of which the end of a band to be wound on is inserted. The stepped core 1 is then axially displaced by means of a rod and piston 23, 23a, and in consequence of the pitch or inclination of the wedge-surfaces 5 that expand the closing fillets 4 on the stepped core 1 being greater than the pitch or inclination of the wedge-surfaces 14 that spread the seg ments 12, the band end is firmly clamped between the closing fillet and the adjacent segment.

In FIGURE 1, a closing fillet 4 without a clamping device, and a closing fillet 4a provided with the clamping device according to this invention, are confronted with one another. The closing fillet 4a is provided, upon an inclined surface co-operating with the adjacent segment 12, with a recess 15, which extends over the entire length of the closing fillet 4a, and which widens out towards the center of the drum, and is of substantially triangular cross section. In the recess 15 is lodged a wedge-shaped clamping fillet 16, which by means of springs 17 is urged resiliently outwards in the radial direction of the drum. The radial play of the clamping fillet 16, which bears, in the base of the recess 15, upon a surface a parallel to the direction of radial adjustment of the closing fillet 4a, is rendered possible by radial slots 18, through which screw studs 19 pass, which connect the clamping fillet 16 with the closing fillet 4a.

On its inclined surface facing the adjacent segment 12 and constituting the inclined surface of the closing fillet 4a, the clamping fillet 16 is roughened by providing it with corrugations or ridges 29a, whereas the surface by which the clamping fillet bears on the base 15a of the recess 15 is smooth. Hence the coefficient of friction between the ridged inclined surface 20, 20a and the clampedin end 21 of the band is greater than that between the bearing surface of the clamping fillet 16 and the base 15a of the recess 15 in the closing fillet 4a. This difference between the coefficients of friction has the result that the pull acting on the band 21 draws the corrugated side surface 20 of the clamping fillet 16 against the segment 12, and thereby firmly clamps the band, while the clamping fillet 16 slips relatively to the surface 15a of the recess 15. With increasing tension in the band, the clamping effect therefore increases. Owing to the radial displaceability of the clamping fillet 16 against the force of the springs 17, bands of different thicknesses can be clamped without the spreading travel of the closing fillets 4 and 4a being shortened. The clamping fillet 16 compresses the springs 17 more strongly towards the center of the drum when a thick band is introduced than when a thinner band is introduced, and thus frees a wider slot between itself and the adjacent segment. The closing fillets and the segments therefore always form, in the winding position, a closed drum periphery free from gaps.

When a single clamping appliance is provided on the periphery of the drum, it is preferable to mark the clamping position, by color for example. Alternatively, however, more than one closing fillet 4, or even all of them, when several are provided, may be provided with clamping means.

I claim:

1. For winding and unwinding cold-rolled hands, a reeling drum comprising:

a drum periphery consisting of radially movable segments and radially movable closing fillets intervening between the segments, an axially displaceable spreader member within the drum, means for axially displacing the said member, wedge surfaces on the axially displaceable member,

adapted to engage the radially movable segments and 4;- closing fillets and to impel them radially outwards when the said spreader member is axially displaced in one direction and to permit them to move radially inwards when it is axially displaced. in the opposite direction,

the wedge surfaces that act on the closing fillets being steeper but shorter than the wedge surfaces that act on the movable segments,

so that at one stage the external surfaces of the segments and of the closing fillets form a substantially gapless periphery of the reeling drum, the outward movement of the closing fillets being then completed, whereas upon further movement of the axially displaceable member in said one direction the outward movement of the segments continues,

at least one of the closing fillets being formed, upon a side surface co-operating with an adjacent segment, with a recess of substantially triangular cross section extending throughout the length of the closing fillet,

and the reeling drum further comprising a wedge-shaped clamping fillet lodged in the said recess and having a substantially radial side bearing against a surface of the closing fillet which is substantially parallel to the direction of radial movement of the closing fillet,

and an inclined side which is adapted to engage, be-

tween itself and an inclined side of the adjacent segment, the end of a band to be wound on the reel.

2. A reeling drum as claimed in claim 1, wherein the inclined side, adapted to engage the adjacent Segment, of the clamping fillet, is roughened, so that the coefficient of friction between this roughened inclined surface and the clamped-in band end is greater than that between the substantially radial bearing surface of the clamping fillet and the side of the recess in the closing fillet.

References Cited in the file of this patent UNITED STATES PATENTS 1,603,017 Biggert et al. Oct. 12, 1926 2,321,146 Jones June 8, 1943 2,564,482 Kentis Aug. 14, 1951 2,638,284 Rahfuse May 12, 1953 2,755,031 Russell July 17, 1956 2,941,745 Penrine June 21, 1960 2,989,263 Smeets June 20, 1961 FOREIGN PATENTS 1,007,279 Germany May 2. 1957 

